The effect of antimony additions on the characteristics of melt-spun Pb-
12 wt.%Sn alloy was investigated. The dynamic resonance technique was
applied to study the internal friction, Young`s modulus and thermal diffusivity.
Also, the dependence of specific heat under constant pressure on Sb content was
studied. Isothermal resistivity changes were used to trace the discontinuous
precipitation in the studied alloys. It was suggested that inhibited boundary
movement caused by Sb segregation at the sweeping reaction fronts retard and
ultimately terminate the discontinuous precipitation process. Marked effect was
observed with lower Sb addition. X-rays and differential thermal analysis were
used to identify structure variations as bases to explain the observed results.